Siemens SINAMICS S120 Manual page 151

Parallel connection of Smart Line Modules to increase power rating
Up to four Smart Line Modules with the same power rating can be connected in parallel in
order to increase power.
Smart Line Modules with "mirror-image" power connections enable the parallel connection of
these modules in a compact configuration. Order numbers for devices that are arranged to
the left of the Line Connection Module have a "C" in the next-to-last position,
example: 6SL3730-6TE41-1BC3.
The following rules must be observed when connecting Smart Line Modules in parallel:
● Up to 4 identical Smart Line Modules can be connected in parallel.
● The parallel connection must be implemented using a Control Unit.
● A 4% reactor is always required upstream of each Smart Line Module for the purpose of
● Special Line Connection Modules are available for connecting the modules in parallel.
● With multiple infeeds, power must be supplied to the systems from a common infeed
● A derating factor of 7.5% must be taken into consideration, regardless of the number of
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A
current balancing.
point (i.e. the modules cannot be operated on different supplies).
modules connected in parallel.
Cabinet Modules
5.3 Smart Line Modules
151